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Stock-Based Compensation - Additional Information (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Dividends paid $ 0us-gaap_PaymentsOfDividendsCommonStock 0us-gaap_PaymentsOfDividendsCommonStock 0us-gaap_PaymentsOfDividendsCommonStock  
Unrecognized compensation cost 3,900,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized      
Cash received from stock option exercises and employee stock purchases 6,100,000us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions      
Cash used for shares withheld to satisfy employee tax obligations for NQOs exercised and RSUs converted 7,800,000us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation      
Tax benefit from stock options exercised during the period 89,300,000us-gaap_IncomeTaxExpenseBenefit 76,000,000us-gaap_IncomeTaxExpenseBenefit 74,100,000us-gaap_IncomeTaxExpenseBenefit  
Shares authorized for future grant under stock plan (in shares) 3,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant      
Non-qualified stock options        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Options vesting period 3 years      
Options expiration period 10 years      
Period of historical option activity considered to determine expected option life 10 years      
Number of separate employee groups 2hxl_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsNumberOfEmployeeGroups
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockOptionMember
     
Unrecognized compensation cost 1,100,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockOptionMember
1,600,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockOptionMember
   
Tax benefit from stock options exercised during the period 5,800,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockOptionMember
     
Non-qualified stock options | Minimum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Period over which unrecognized compensation costs will be recognized 1 year      
Non-qualified stock options | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Period over which unrecognized compensation costs will be recognized 3 years      
RSUs        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of shares outstanding 511,786us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= hxl_ServicesBasedRestrictedStockUnitsMember
600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= hxl_ServicesBasedRestrictedStockUnitsMember
800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= hxl_ServicesBasedRestrictedStockUnitsMember
900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= hxl_ServicesBasedRestrictedStockUnitsMember
RSUs | Minimum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Period over which unrecognized compensation costs will be recognized 1 year      
RSUs | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Period over which unrecognized compensation costs will be recognized 3 years      
PRSUs        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of shares outstanding 443,969us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= hxl_PerformanceBasedRestrictedStockUnitsMember
500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= hxl_PerformanceBasedRestrictedStockUnitsMember
500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= hxl_PerformanceBasedRestrictedStockUnitsMember
700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_PlanNameAxis
= hxl_PerformanceBasedRestrictedStockUnitsMember
Unrecognized compensation cost $ 2,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_PlanNameAxis
= hxl_PerformanceBasedRestrictedStockUnitsMember
     
Performance period 3 years 3 years 3 years  
PRSUs | Minimum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Period over which unrecognized compensation costs will be recognized 1 year      
Performance period 3 years      
Current projections and performance targets estimated additional performance shares issuable 300,000hxl_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPotentiallyIssuableShares
/ us-gaap_PlanNameAxis
= hxl_PerformanceBasedRestrictedStockUnitsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
PRSUs | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Period over which unrecognized compensation costs will be recognized 3 years      
Employee stock purchase plan        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Maximum contribution by eligible employees as percentage of base earnings (as a percent) 10.00%hxl_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeContributionAsPercentageOfBaseEarnings
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
     
Common stock purchase price as percentage of fair market value (as a percent) 85.00%hxl_ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePriceAsPercentageOfFairMarketValue
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
     
Shares purchased under employee stock purchase plan (in shares) 28,453us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
31,003us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember